Woodworking-clamp.



No. 887,103. PATENTED MAY 12, 1908.

J. H. LANE.

WOODWORKING CLAMP.

APPLICATION FILED AUG. 17, 1906. RENEWED SEPT. 28, 1907.

' 2 SHEETS-SHEET l.

No. 887,103. PATENTED MAY 12, 1908.

J. H. LANE.

WOODWORKING CLAMP.

APPLICATION FILED AU G.17, 1906. RENEWED SEPT. 28, 1907.

' 2 SHEETS-SHEET 2.

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' I all times securing t NITED STATES PATENT orinon; I

JOHN H. LANE, orJAcKsom-lMIcHIcAN.

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Specification of Letters Patent.

. Patented-May 12, 1908i Application filed August 17, 1906, Serial No. 331,087. Renewed September'28, 1907. Serial No. 395,035.

I To all whom it may Camera:

Be it known that I, JOHN H. LANE, a citizen of the United States, residing at Jackson, in the county of Jackson and State of Michigan, have invented certain new and useful Im rovements in Woodworking-Clamps, of WhlQll the. following is a specification.

This invention relates to wood working and has special reference to a practical and novel construction of wood working clamp capable of general application as a clamp for wood Workers use, though possessing special, utility as a gluin clamp for effecting a uniform and perfect g no joint between separatepieces of Wood.

,To this end the invention primarily contemplates a clam providing simple, practical andefiectuai meansffor clam in toj (gle'ther sections or blocks ofwood w ic are 20 lines, thereby obviating the common expeesigned to be glued upj on curved or circular dients of, nailing or utilizing patternmakers dogs for that purpose.

In'pattern making it has been found that a good glue joint cannot be satisfactorily made by utilizin' the expedients referredto, nor withoutunift ormly pressing the wooden sectionsfirmly together to insure a uniform distribution of theglue, while at the same time maintaining a tight joint ,at all oints until the glue has set, as'provided for y the present invention. I

Also, the invention has-for its object the provision of a clamp'capable of adjustment to material of largel varying width, while at he novel result of applying a direct pressure at three. distinct points, which 'ressure is exerted in directions-for not 0 y rigidly holding the sections to be matched (or glued, but at the same time drawing and binding these sections'together to maintain a perfect joint 'until the glue has set.

a With these and many other objects in view it will be readily apparent to those familiar with'the art, the same consists in the novel construction, combination and arrangement of parts hereinafter more fully described and illustrated in the claims.

Theessential feature of ,the invention'involved in he novelarrangementof parts for securing a direct pressure upon the work to structur modification without departing which.

. Figure 1 is a side elevation partly "in section of a wood working clamp constructed in accordance with the present invention, and showing the clam members close upon two sections of wood or gluing purposes.- Fig, 2 is a similar view-showingithe'clamp open and illustrating the use ,thereofwith the eccentric or scroll gripping dogs removed. Figs. 3 and 4 are elevations of .the'modified form of of lever actuating means, i

parts in the several figures of the drawings.

In carrying out the invention, the same'i-ncludes in its general organization, the oppos'itely arranged swinging lever arms 1. -1, pivotally su aet their en s by the fulcrum pins 2, upon the gpposite extremities of an interposed fulcrum crum portions block or section, a, arranged upon another wooden block or section, b, for gluing or other purposes. At its u per extremity the screw rod is provided wit for purposes of between-said gri bar 3, the threaded portion of the screw rod engages the central nut 9, of a shiftable cross head 10. -Also between the cross head 10 a jam-nut 11, which is-adiusted to find mi from the scope of the invention, but preferred practical embodiments thereof areshown' in the accompanying drawings in ,the'clamp illustrating theuse of another form 1 .Like references des gnate corresponding ported or fulcrumed intermediwhat may be termed the second wooden a hand or finger grip 8,- -manipulating the, same and. and the transverse fulcrum' 'and.the fulcrum bar 3, the screw rod engages.

from three points, is necessarily" susceptible The bar 3 is provided with the bifur .cated end heads 4, receiving therein the fulbar 3.

abutment against one side of the fulcrum lever arms 1, is provided at the end opposite its toothed portion with an inner widened clamp foot 16, which under some conditions directly engages the work to be clamped. In

I addition to the clamp foot 16, each lever. arm

is bifurcated at that end asat 17 to receive therein the pivoted ear 18 of an eccentric or scroll gri ping dog 19, having a forked inner end 20 a apted to work astride the lever arm above its blfurcation 17. For finished work it is preferable to have the engaging or bearing faces of the dogs 19 perfectly smooth although in some classes of work these faces may be slightly roughened or corrugated as well as the face -of the clam feet 16. The pivoted cars 18 receive the pivoted screws 21 which provide for detachabl holding the rockin gripping dogs upon t e ends of the clamp evers. v

From the construction described, and shown in '1 of the drawings, it will be observed that when the screw rod 6, is tightened down to bring its clamp foot 7, in enrga'gement with the second wooden block, a,

the continuedmovement of such rod will necessarily re-act to shift the cross head 10' with the result of rocking the eccentric or scroll gears 14 in a direction for spreading the toothed ends of the lever arms, and moving the other ends thereof inward. .This inward movement of the gripping1 ends of the lever. arms results in carrying t the sides of the first wooden section, b, and

' by reason of the eccentric or scroll form of these dogs, the same will rock on their tpivots,

and this rocking, though slight, will e in a direction tending to draw the wooden section, 1), toward the wooden section, a, while the 1 latter-is moved in the reverse direction by the clam foot 7. Thisresults-inholding the woo en sections or blocks 'in a perfect joint until the glue is set.

I In some classes of work, such for instance as gluing the pieces across the end of a wide board to prevent it from warping, instead of using a long clamp, the present invention may be utilized; as shown in Fig. 2 by omit-. tingthe gri ping do s 19. Also, as shown in Figs. 3 an 4' of t f e. drawings, the novel clamping action herein-described may be carried out in connection with different lever actuating means. For instance, as shown in e dogs 19 against center.

said figures of the drawings, I may employ a cross head 10, with its central nut. 9, but having an adjusting link connection 22, between'each end and one of the extremities of one of the lever arms 1. The links 22 are pivotally connected with the lever arms and the shiftable cross-head and when the clamp foot 7 reaches the work, the upward movement of the cross head 10 will spread said links and thereby effect the inward movement of the gripping or clamping portions of the lever Stop pro ect1ons 23 may be provided on theend portions of the cross-head 10 for'preventing the cross-head moving to a dead center position.

In connection with the modification above the drawings, it will be observed that there is shown a modified type of locking device.-

This locking device is designated in its en'- tirety by the reference character 30 and takes the lace of the-jam nut 11 shown in the other 11 ures of-the drawings. The said locking devlce 30 may be characterized as a lock nut consisting of a knob or hand wheel member 31 and an exteriorly threaded sleeve 32 engaging threads 33 Within the bore of the guide opening 5 throu h the fulcrum bar 3. The knob or hand w eel mem ber 31 at the upper end of the sleeve 32 lies beneath the cross head 10 and when screwed backwards and upwards as shown in Fig. 3, abuts against the nut portion 9*of the cross head 10 thus locking the lever arms against the side of the work. When screwed down to the position shown in Fig. 1, the locking device 30 permitsfull play for the fulcrum ar 3.

' From the foregoing it is thought that the l l construction, operation and many advantages of the herein described clamp be readily apparent without further description.

I claim:

1. A clamp of-the class described,.comprising a fulcrum bar, lever arms fulcrumed to said bar, eccentric gripping dogsmounted on one end of the'lever arms, across head oper- I atively connected to one end portlon'of the lever arms, and a centrallyarranged .rod ex' tending through the cross'head and fulcrum bar and carrying a clamp foot, said dogs and clamp foot being arranged to exert a direct pressure upon 2. A clamp-of the class described comprising lever armshavi'ng rack teeth at one end, eccentric rocking gripping dogs pivotally mounted on the opposite ends of the lever arms, a cross-head, rocking scroll -gears ivoted to saidfhead andengagingthe teeth of the lever arms, and a'central rod carrying a clamping foot and arranged to shift ormove the cross-head.

the rail from three points to a p 3. A clamp of the class described comprising a fulcrum bar having a central guide cross-head and fulcrum bar and carrying a opening, lever arms fulcrumed to the ends of clamp foot.

said bar, eccentric or scroll gripping dogs In testimony whereof I hereunto aflix my pivotally and detachably mounted on one signature in the presence of two witnesses.

5 end of the lever arms, a shiftable cross-head JOHN H. LANE. .havin a central nut and operatively 'con- 7 Witnessesi o necte with one end portion of the lever HENRY A. NORTHRUP, arms, and. a screw rod extending through the LE RoY N ORTHBUP. 

